{
  "schema_version": "1.0.0",
  "content_version": "1.0.0",
  "module_id": "m27",
  "title": "Two or Three Beats",
  "seed": 710041,
  "preset": {
    "id": "duple-triple-grouping-beginner",
    "difficulty": "beginner",
    "item_count": 10,
    "candidate_set": [
      "duple",
      "triple"
    ],
    "pitch_range_midi": [
      60,
      79
    ],
    "tempo_bpm": 80,
    "meter": [
      3,
      4
    ],
    "hints": true
  },
  "purpose": "Hear two groups of three eighths or three groups of two.",
  "instructions": {
    "student": "Classify each accent cycle from more than one repetition. Do not infer grouping from how many seconds the excerpt lasts.",
    "teacher": "Play each numbered question from this page. Use the same replay policy for all learners. Keep the answer section separate until the first response is recorded. For tapping tasks, record an observation on paper; use the online trainer for device-timed scoring.",
    "follow_up": "Count the accent cycle in two new excerpts without carrying the previous grouping forward."
  },
  "examples": {
    "demonstration": {
      "id": "m27-712768-0",
      "seed": 712768,
      "kind": "grouping",
      "events": [
        {
          "midi": 81,
          "onset_beats": 0,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 0.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 1,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 1.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 2,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 2.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 3,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 3.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 4,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 4.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 5,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 5.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "duple",
          "label": "Two groups of three (6/8)",
          "rhythm": [
            {
              "onset_beats": 0,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 0.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 1,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 1.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 2,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 2.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 3,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 3.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 4,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 4.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 5.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            }
          ],
          "events": [
            {
              "midi": 81,
              "onset_beats": 0,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 0.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 1,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 1.5,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 2,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 2.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 3,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 3.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 4,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 4.5,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 5.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "triple",
          "label": "Three groups of two (3/4)",
          "rhythm": [
            {
              "onset_beats": 0,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 0.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 1,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 1.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 2,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 2.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 3,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 3.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 4,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 4.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 5.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            }
          ],
          "events": [
            {
              "midi": 81,
              "onset_beats": 0,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 0.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 1,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 1.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 2,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 2.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 3,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 3.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 4,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 4.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 5,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 5.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            }
          ]
        }
      ],
      "answer": "triple",
      "explanation": "The stronger attacks fall every two eighth notes: ONE and TWO and THREE and. These are three quarter-note beats in 3/4.",
      "notation": {
        "clef": "treble",
        "notes": [
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5"
        ],
        "bar_beats": 3
      },
      "total_beats": 6,
      "rhythm": [
        {
          "onset_beats": 0,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 0.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 1,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 1.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 2,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 2.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 3,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 3.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 4,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 4.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 5.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        }
      ],
      "instructions": "Listen for the stronger attacks. How are the six eighth notes grouped?"
    },
    "comparison": {
      "id": "m27-712768-0",
      "seed": 712768,
      "kind": "grouping",
      "events": [
        {
          "midi": 81,
          "onset_beats": 0,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 0.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 1,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 1.5,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 2,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 2.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 3,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 3.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 4,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 4.5,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 5.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "triple",
          "label": "Three groups of two (3/4)",
          "rhythm": [
            {
              "onset_beats": 0,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 0.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 1,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 1.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 2,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 2.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 3,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 3.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 4,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 4.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 5.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            }
          ],
          "events": [
            {
              "midi": 81,
              "onset_beats": 0,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 0.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 1,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 1.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 2,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 2.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 3,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 3.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 4,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 4.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 5,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 5.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "duple",
          "label": "Two groups of three (6/8)",
          "rhythm": [
            {
              "onset_beats": 0,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 0.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 1,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 1.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 2,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 2.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 3,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 3.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 4,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 4.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 5.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            }
          ],
          "events": [
            {
              "midi": 81,
              "onset_beats": 0,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 0.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 1,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 1.5,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 2,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 2.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 3,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 3.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 4,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 4.5,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
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            {
              "midi": 76,
              "onset_beats": 5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
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            {
              "midi": 76,
              "onset_beats": 5.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
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          ]
        }
      ],
      "answer": "duple",
      "explanation": "The stronger attacks fall every three eighth notes: ONE two three FOUR five six. These are two dotted-quarter beats in 6/8.",
      "notation": {
        "clef": "treble",
        "notes": [
          "A5",
          "E5",
          "E5",
          "A5",
          "E5",
          "E5",
          "A5",
          "E5",
          "E5",
          "A5",
          "E5",
          "E5"
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        "bar_beats": 3
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      "total_beats": 6,
      "rhythm": [
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          "onset_beats": 0,
          "duration_beats": 0.5,
          "rest": false,
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        {
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          "duration_beats": 0.5,
          "rest": false,
          "accent": false
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        {
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          "duration_beats": 0.5,
          "rest": false,
          "accent": false
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        {
          "onset_beats": 1.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 2,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 2.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 3,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 3.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 4,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 4.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 5.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        }
      ],
      "instructions": "Listen for the stronger attacks. How are the six eighth notes grouped?"
    },
    "seed": 712768,
    "comparisonSeed": 712768
  },
  "questions": [
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          "events": [
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            {
              "midi": 76,
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            {
              "midi": 81,
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            {
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            {
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            {
              "midi": 81,
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              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
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            {
              "midi": 76,
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              "duration_beats": 0.14,
              "velocity": 0.65,
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            {
              "midi": 76,
              "onset_beats": 4,
              "duration_beats": 0.14,
              "velocity": 0.65,
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            {
              "midi": 81,
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              "duration_beats": 0.14,
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              "midi": 76,
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        {
          "id": "triple",
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              "rest": false,
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            {
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              "duration_beats": 0.5,
              "rest": false,
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            {
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              "rest": false,
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            {
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              "duration_beats": 0.5,
              "rest": false,
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            {
              "onset_beats": 2,
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              "rest": false,
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            {
              "onset_beats": 2.5,
              "duration_beats": 0.5,
              "rest": false,
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            {
              "onset_beats": 3,
              "duration_beats": 0.5,
              "rest": false,
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            {
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              "duration_beats": 0.5,
              "rest": false,
              "accent": false
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            {
              "onset_beats": 4,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
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            {
              "onset_beats": 4.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
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            {
              "onset_beats": 5.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
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          ],
          "events": [
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            {
              "midi": 76,
              "onset_beats": 0.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
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            {
              "midi": 81,
              "onset_beats": 1,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
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            {
              "midi": 76,
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              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
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            {
              "midi": 81,
              "onset_beats": 2,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
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            {
              "midi": 76,
              "onset_beats": 2.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
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            {
              "midi": 81,
              "onset_beats": 3,
              "duration_beats": 0.14,
              "velocity": 0.8,
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            {
              "midi": 76,
              "onset_beats": 3.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
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            {
              "midi": 81,
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              "duration_beats": 0.14,
              "velocity": 0.8,
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            {
              "midi": 76,
              "onset_beats": 4.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
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            {
              "midi": 81,
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              "velocity": 0.8,
              "voice_id": "triangle"
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            {
              "midi": 76,
              "onset_beats": 5.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
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          ]
        }
      ],
      "answer": "duple",
      "explanation": "The stronger attacks fall every three eighth notes: ONE two three FOUR five six. These are two dotted-quarter beats in 6/8.",
      "notation": {
        "clef": "treble",
        "notes": [
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          "E5",
          "E5",
          "A5",
          "E5",
          "E5",
          "A5",
          "E5",
          "E5",
          "A5",
          "E5",
          "E5"
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        "bar_beats": 3
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      "total_beats": 6,
      "rhythm": [
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          "onset_beats": 0,
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        {
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          "rest": false,
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        {
          "onset_beats": 1,
          "duration_beats": 0.5,
          "rest": false,
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        {
          "onset_beats": 1.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 2,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 2.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 3,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 3.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 4,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 4.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 5.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
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      ],
      "instructions": "Listen for the stronger attacks. How are the six eighth notes grouped?"
    },
    {
      "id": "m27-710041-1",
      "seed": 717960,
      "kind": "grouping",
      "events": [
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          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
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        {
          "midi": 76,
          "onset_beats": 0.5,
          "duration_beats": 0.14,
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          "voice_id": "triangle"
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        {
          "midi": 81,
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          "duration_beats": 0.14,
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        {
          "midi": 76,
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          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 2,
          "duration_beats": 0.14,
          "velocity": 0.8,
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        },
        {
          "midi": 76,
          "onset_beats": 2.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
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        {
          "midi": 81,
          "onset_beats": 3,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
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        {
          "midi": 76,
          "onset_beats": 3.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
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        {
          "midi": 81,
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          "duration_beats": 0.14,
          "velocity": 0.8,
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        {
          "midi": 76,
          "onset_beats": 4.5,
          "duration_beats": 0.14,
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          "voice_id": "triangle"
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        {
          "midi": 81,
          "onset_beats": 5,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
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        {
          "midi": 76,
          "onset_beats": 5.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
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      ],
      "choices": [
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            {
              "onset_beats": 3,
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              "rest": false,
              "accent": true
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            {
              "onset_beats": 3.5,
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              "rest": false,
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            {
              "onset_beats": 4,
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            {
              "onset_beats": 4.5,
              "duration_beats": 0.5,
              "rest": false,
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            {
              "onset_beats": 5,
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            {
              "onset_beats": 5.5,
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          ],
          "events": [
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            {
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            {
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            {
              "midi": 76,
              "onset_beats": 2.5,
              "duration_beats": 0.14,
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              "voice_id": "triangle"
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            {
              "midi": 81,
              "onset_beats": 3,
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            {
              "midi": 76,
              "onset_beats": 3.5,
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            {
              "midi": 76,
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            {
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              "duration_beats": 0.14,
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            {
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              "onset_beats": 5,
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              "onset_beats": 5.5,
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              "voice_id": "triangle"
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          ]
        },
        {
          "id": "triple",
          "label": "Three groups of two (3/4)",
          "rhythm": [
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              "onset_beats": 0,
              "duration_beats": 0.5,
              "rest": false,
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            {
              "onset_beats": 0.5,
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              "rest": false,
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            {
              "onset_beats": 1,
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            {
              "onset_beats": 1.5,
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            {
              "onset_beats": 2,
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              "accent": true
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            {
              "onset_beats": 2.5,
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              "rest": false,
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            {
              "onset_beats": 3,
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              "rest": false,
              "accent": true
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            {
              "onset_beats": 3.5,
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              "rest": false,
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            },
            {
              "onset_beats": 4,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 4.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 5.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            }
          ],
          "events": [
            {
              "midi": 81,
              "onset_beats": 0,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 0.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 1,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 1.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 2,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 2.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 3,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 3.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 4,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 4.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 5,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 5.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            }
          ]
        }
      ],
      "answer": "triple",
      "explanation": "The stronger attacks fall every two eighth notes: ONE and TWO and THREE and. These are three quarter-note beats in 3/4.",
      "notation": {
        "clef": "treble",
        "notes": [
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5"
        ],
        "bar_beats": 3
      },
      "total_beats": 6,
      "rhythm": [
        {
          "onset_beats": 0,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 0.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 1,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 1.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 2,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 2.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 3,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 3.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 4,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 4.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 5.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        }
      ],
      "instructions": "Listen for the stronger attacks. How are the six eighth notes grouped?"
    },
    {
      "id": "m27-710041-2",
      "seed": 725879,
      "kind": "grouping",
      "events": [
        {
          "midi": 81,
          "onset_beats": 0,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 0.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 1,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 1.5,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 2,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 2.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 3,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 3.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 4,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 4.5,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 5.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "duple",
          "label": "Two groups of three (6/8)",
          "rhythm": [
            {
              "onset_beats": 0,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 0.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 1,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 1.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 2,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 2.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 3,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 3.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 4,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 4.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 5.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            }
          ],
          "events": [
            {
              "midi": 81,
              "onset_beats": 0,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 0.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 1,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 1.5,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 2,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 2.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 3,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 3.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 4,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 4.5,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 5.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "triple",
          "label": "Three groups of two (3/4)",
          "rhythm": [
            {
              "onset_beats": 0,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 0.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 1,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 1.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 2,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 2.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 3,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 3.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 4,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 4.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 5.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            }
          ],
          "events": [
            {
              "midi": 81,
              "onset_beats": 0,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 0.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 1,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 1.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 2,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 2.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 3,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 3.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 4,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 4.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 5,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 5.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            }
          ]
        }
      ],
      "answer": "duple",
      "explanation": "The stronger attacks fall every three eighth notes: ONE two three FOUR five six. These are two dotted-quarter beats in 6/8.",
      "notation": {
        "clef": "treble",
        "notes": [
          "A5",
          "E5",
          "E5",
          "A5",
          "E5",
          "E5",
          "A5",
          "E5",
          "E5",
          "A5",
          "E5",
          "E5"
        ],
        "bar_beats": 3
      },
      "total_beats": 6,
      "rhythm": [
        {
          "onset_beats": 0,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 0.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 1,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 1.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 2,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 2.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 3,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 3.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 4,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 4.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 5.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        }
      ],
      "instructions": "Listen for the stronger attacks. How are the six eighth notes grouped?"
    },
    {
      "id": "m27-710041-3",
      "seed": 733798,
      "kind": "grouping",
      "events": [
        {
          "midi": 81,
          "onset_beats": 0,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 0.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 1,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 1.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 2,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 2.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 3,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 3.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 4,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 4.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 5,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 5.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "duple",
          "label": "Two groups of three (6/8)",
          "rhythm": [
            {
              "onset_beats": 0,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 0.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 1,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 1.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 2,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 2.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 3,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 3.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 4,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 4.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 5.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            }
          ],
          "events": [
            {
              "midi": 81,
              "onset_beats": 0,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 0.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 1,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 1.5,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 2,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 2.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 3,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 3.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 4,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 4.5,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 5.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "triple",
          "label": "Three groups of two (3/4)",
          "rhythm": [
            {
              "onset_beats": 0,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 0.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 1,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 1.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 2,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 2.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 3,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 3.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 4,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 4.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 5.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            }
          ],
          "events": [
            {
              "midi": 81,
              "onset_beats": 0,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 0.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 1,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 1.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 2,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 2.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 3,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 3.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 4,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 4.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 5,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 5.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            }
          ]
        }
      ],
      "answer": "triple",
      "explanation": "The stronger attacks fall every two eighth notes: ONE and TWO and THREE and. These are three quarter-note beats in 3/4.",
      "notation": {
        "clef": "treble",
        "notes": [
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5"
        ],
        "bar_beats": 3
      },
      "total_beats": 6,
      "rhythm": [
        {
          "onset_beats": 0,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 0.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 1,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 1.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 2,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 2.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 3,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 3.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 4,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 4.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 5.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        }
      ],
      "instructions": "Listen for the stronger attacks. How are the six eighth notes grouped?"
    },
    {
      "id": "m27-710041-4",
      "seed": 741717,
      "kind": "grouping",
      "events": [
        {
          "midi": 81,
          "onset_beats": 0,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 0.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 1,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 1.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 2,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 2.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 3,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 3.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 4,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 4.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 5,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 5.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "duple",
          "label": "Two groups of three (6/8)",
          "rhythm": [
            {
              "onset_beats": 0,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 0.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 1,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 1.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 2,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 2.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 3,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 3.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 4,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 4.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 5.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            }
          ],
          "events": [
            {
              "midi": 81,
              "onset_beats": 0,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 0.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 1,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 1.5,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 2,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 2.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 3,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 3.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 4,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 4.5,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 5.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "triple",
          "label": "Three groups of two (3/4)",
          "rhythm": [
            {
              "onset_beats": 0,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 0.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 1,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 1.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 2,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 2.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 3,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 3.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 4,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 4.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 5.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            }
          ],
          "events": [
            {
              "midi": 81,
              "onset_beats": 0,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 0.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 1,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 1.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 2,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 2.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 3,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 3.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 4,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 4.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 5,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 5.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            }
          ]
        }
      ],
      "answer": "triple",
      "explanation": "The stronger attacks fall every two eighth notes: ONE and TWO and THREE and. These are three quarter-note beats in 3/4.",
      "notation": {
        "clef": "treble",
        "notes": [
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5"
        ],
        "bar_beats": 3
      },
      "total_beats": 6,
      "rhythm": [
        {
          "onset_beats": 0,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 0.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 1,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 1.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 2,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 2.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 3,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 3.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 4,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 4.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 5.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        }
      ],
      "instructions": "Listen for the stronger attacks. How are the six eighth notes grouped?"
    },
    {
      "id": "m27-710041-5",
      "seed": 749636,
      "kind": "grouping",
      "events": [
        {
          "midi": 81,
          "onset_beats": 0,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 0.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 1,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 1.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 2,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 2.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 3,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 3.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 4,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 4.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 5,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 5.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "duple",
          "label": "Two groups of three (6/8)",
          "rhythm": [
            {
              "onset_beats": 0,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 0.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 1,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 1.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 2,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 2.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 3,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 3.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 4,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 4.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 5.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            }
          ],
          "events": [
            {
              "midi": 81,
              "onset_beats": 0,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 0.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 1,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 1.5,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 2,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 2.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 3,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 3.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 4,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 4.5,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 5.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "triple",
          "label": "Three groups of two (3/4)",
          "rhythm": [
            {
              "onset_beats": 0,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 0.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 1,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 1.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 2,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 2.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 3,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 3.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 4,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 4.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 5.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            }
          ],
          "events": [
            {
              "midi": 81,
              "onset_beats": 0,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 0.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 1,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 1.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 2,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 2.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 3,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 3.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 4,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 4.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 5,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 5.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            }
          ]
        }
      ],
      "answer": "triple",
      "explanation": "The stronger attacks fall every two eighth notes: ONE and TWO and THREE and. These are three quarter-note beats in 3/4.",
      "notation": {
        "clef": "treble",
        "notes": [
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5"
        ],
        "bar_beats": 3
      },
      "total_beats": 6,
      "rhythm": [
        {
          "onset_beats": 0,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 0.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 1,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 1.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 2,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 2.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 3,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 3.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 4,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 4.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 5.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        }
      ],
      "instructions": "Listen for the stronger attacks. How are the six eighth notes grouped?"
    },
    {
      "id": "m27-710041-6",
      "seed": 757555,
      "kind": "grouping",
      "events": [
        {
          "midi": 81,
          "onset_beats": 0,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 0.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 1,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 1.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 2,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 2.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 3,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 3.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 4,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 4.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 5,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 5.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "duple",
          "label": "Two groups of three (6/8)",
          "rhythm": [
            {
              "onset_beats": 0,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 0.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 1,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 1.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 2,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 2.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 3,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 3.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 4,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 4.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 5.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            }
          ],
          "events": [
            {
              "midi": 81,
              "onset_beats": 0,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 0.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 1,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 1.5,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 2,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 2.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 3,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 3.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 4,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 4.5,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 5.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "triple",
          "label": "Three groups of two (3/4)",
          "rhythm": [
            {
              "onset_beats": 0,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 0.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 1,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 1.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 2,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 2.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 3,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 3.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 4,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 4.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 5.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            }
          ],
          "events": [
            {
              "midi": 81,
              "onset_beats": 0,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 0.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 1,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 1.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 2,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 2.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 3,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 3.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 4,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 4.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 5,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 5.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            }
          ]
        }
      ],
      "answer": "triple",
      "explanation": "The stronger attacks fall every two eighth notes: ONE and TWO and THREE and. These are three quarter-note beats in 3/4.",
      "notation": {
        "clef": "treble",
        "notes": [
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5"
        ],
        "bar_beats": 3
      },
      "total_beats": 6,
      "rhythm": [
        {
          "onset_beats": 0,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 0.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 1,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 1.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 2,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 2.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 3,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 3.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 4,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 4.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 5.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        }
      ],
      "instructions": "Listen for the stronger attacks. How are the six eighth notes grouped?"
    },
    {
      "id": "m27-710041-7",
      "seed": 765474,
      "kind": "grouping",
      "events": [
        {
          "midi": 81,
          "onset_beats": 0,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 0.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 1,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 1.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 2,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 2.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 3,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 3.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 4,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 4.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 5,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 5.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "duple",
          "label": "Two groups of three (6/8)",
          "rhythm": [
            {
              "onset_beats": 0,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 0.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 1,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 1.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 2,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 2.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 3,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 3.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 4,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 4.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 5.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            }
          ],
          "events": [
            {
              "midi": 81,
              "onset_beats": 0,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 0.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 1,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 1.5,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 2,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 2.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 3,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 3.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 4,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 4.5,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 5.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "triple",
          "label": "Three groups of two (3/4)",
          "rhythm": [
            {
              "onset_beats": 0,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 0.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 1,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 1.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 2,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 2.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 3,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 3.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 4,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 4.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 5.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            }
          ],
          "events": [
            {
              "midi": 81,
              "onset_beats": 0,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 0.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 1,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 1.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 2,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 2.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 3,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 3.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 4,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 4.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 5,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 5.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            }
          ]
        }
      ],
      "answer": "triple",
      "explanation": "The stronger attacks fall every two eighth notes: ONE and TWO and THREE and. These are three quarter-note beats in 3/4.",
      "notation": {
        "clef": "treble",
        "notes": [
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5"
        ],
        "bar_beats": 3
      },
      "total_beats": 6,
      "rhythm": [
        {
          "onset_beats": 0,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 0.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 1,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 1.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 2,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 2.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 3,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 3.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 4,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 4.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 5.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        }
      ],
      "instructions": "Listen for the stronger attacks. How are the six eighth notes grouped?"
    },
    {
      "id": "m27-710041-8",
      "seed": 773393,
      "kind": "grouping",
      "events": [
        {
          "midi": 81,
          "onset_beats": 0,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 0.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 1,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 1.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 2,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 2.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 3,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 3.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 4,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 4.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 5,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 5.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "duple",
          "label": "Two groups of three (6/8)",
          "rhythm": [
            {
              "onset_beats": 0,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 0.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 1,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 1.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 2,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 2.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 3,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 3.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 4,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 4.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 5.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            }
          ],
          "events": [
            {
              "midi": 81,
              "onset_beats": 0,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 0.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 1,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 1.5,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 2,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 2.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 3,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 3.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 4,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 4.5,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 5.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "triple",
          "label": "Three groups of two (3/4)",
          "rhythm": [
            {
              "onset_beats": 0,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 0.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 1,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 1.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 2,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 2.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 3,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 3.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 4,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 4.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 5.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            }
          ],
          "events": [
            {
              "midi": 81,
              "onset_beats": 0,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 0.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 1,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 1.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 2,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 2.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 3,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 3.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 4,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 4.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 5,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 5.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            }
          ]
        }
      ],
      "answer": "triple",
      "explanation": "The stronger attacks fall every two eighth notes: ONE and TWO and THREE and. These are three quarter-note beats in 3/4.",
      "notation": {
        "clef": "treble",
        "notes": [
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5"
        ],
        "bar_beats": 3
      },
      "total_beats": 6,
      "rhythm": [
        {
          "onset_beats": 0,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 0.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 1,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 1.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 2,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 2.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 3,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 3.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 4,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 4.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 5.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        }
      ],
      "instructions": "Listen for the stronger attacks. How are the six eighth notes grouped?"
    },
    {
      "id": "m27-710041-9",
      "seed": 781312,
      "kind": "grouping",
      "events": [
        {
          "midi": 81,
          "onset_beats": 0,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 0.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 1,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 1.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 2,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 2.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 3,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 3.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 4,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 4.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        },
        {
          "midi": 81,
          "onset_beats": 5,
          "duration_beats": 0.14,
          "velocity": 0.8,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 5.5,
          "duration_beats": 0.14,
          "velocity": 0.65,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "duple",
          "label": "Two groups of three (6/8)",
          "rhythm": [
            {
              "onset_beats": 0,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 0.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 1,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 1.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 2,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 2.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 3,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 3.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 4,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 4.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 5.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            }
          ],
          "events": [
            {
              "midi": 81,
              "onset_beats": 0,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 0.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 1,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 1.5,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 2,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 2.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 3,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 3.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 4,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 4.5,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 5.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "triple",
          "label": "Three groups of two (3/4)",
          "rhythm": [
            {
              "onset_beats": 0,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 0.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 1,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 1.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 2,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 2.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 3,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 3.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 4,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 4.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            },
            {
              "onset_beats": 5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": true
            },
            {
              "onset_beats": 5.5,
              "duration_beats": 0.5,
              "rest": false,
              "accent": false
            }
          ],
          "events": [
            {
              "midi": 81,
              "onset_beats": 0,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 0.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 1,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 1.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 2,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 2.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 3,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 3.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 4,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 4.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            },
            {
              "midi": 81,
              "onset_beats": 5,
              "duration_beats": 0.14,
              "velocity": 0.8,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 5.5,
              "duration_beats": 0.14,
              "velocity": 0.65,
              "voice_id": "triangle"
            }
          ]
        }
      ],
      "answer": "triple",
      "explanation": "The stronger attacks fall every two eighth notes: ONE and TWO and THREE and. These are three quarter-note beats in 3/4.",
      "notation": {
        "clef": "treble",
        "notes": [
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5"
        ],
        "bar_beats": 3
      },
      "total_beats": 6,
      "rhythm": [
        {
          "onset_beats": 0,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 0.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 1,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 1.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 2,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 2.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 3,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 3.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 4,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 4.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 5.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        }
      ],
      "instructions": "Listen for the stronger attacks. How are the six eighth notes grouped?"
    }
  ],
  "answer_key": [
    {
      "number": 1,
      "question_id": "m27-710041-0",
      "answer": "duple",
      "label": "Two groups of three (6/8)",
      "explanation": "The stronger attacks fall every three eighth notes: ONE two three FOUR five six. These are two dotted-quarter beats in 6/8.",
      "notation": {
        "clef": "treble",
        "notes": [
          "A5",
          "E5",
          "E5",
          "A5",
          "E5",
          "E5",
          "A5",
          "E5",
          "E5",
          "A5",
          "E5",
          "E5"
        ],
        "bar_beats": 3
      },
      "rhythm": [
        {
          "onset_beats": 0,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 0.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 1,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 1.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 2,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 2.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 3,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 3.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 4,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 4.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 5.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        }
      ],
      "total_beats": 6
    },
    {
      "number": 2,
      "question_id": "m27-710041-1",
      "answer": "triple",
      "label": "Three groups of two (3/4)",
      "explanation": "The stronger attacks fall every two eighth notes: ONE and TWO and THREE and. These are three quarter-note beats in 3/4.",
      "notation": {
        "clef": "treble",
        "notes": [
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5"
        ],
        "bar_beats": 3
      },
      "rhythm": [
        {
          "onset_beats": 0,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 0.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 1,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 1.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 2,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 2.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 3,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 3.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 4,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 4.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 5.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        }
      ],
      "total_beats": 6
    },
    {
      "number": 3,
      "question_id": "m27-710041-2",
      "answer": "duple",
      "label": "Two groups of three (6/8)",
      "explanation": "The stronger attacks fall every three eighth notes: ONE two three FOUR five six. These are two dotted-quarter beats in 6/8.",
      "notation": {
        "clef": "treble",
        "notes": [
          "A5",
          "E5",
          "E5",
          "A5",
          "E5",
          "E5",
          "A5",
          "E5",
          "E5",
          "A5",
          "E5",
          "E5"
        ],
        "bar_beats": 3
      },
      "rhythm": [
        {
          "onset_beats": 0,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 0.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 1,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 1.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 2,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 2.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 3,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 3.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 4,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 4.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 5.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        }
      ],
      "total_beats": 6
    },
    {
      "number": 4,
      "question_id": "m27-710041-3",
      "answer": "triple",
      "label": "Three groups of two (3/4)",
      "explanation": "The stronger attacks fall every two eighth notes: ONE and TWO and THREE and. These are three quarter-note beats in 3/4.",
      "notation": {
        "clef": "treble",
        "notes": [
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5"
        ],
        "bar_beats": 3
      },
      "rhythm": [
        {
          "onset_beats": 0,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 0.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 1,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 1.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 2,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 2.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 3,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 3.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 4,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 4.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 5.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        }
      ],
      "total_beats": 6
    },
    {
      "number": 5,
      "question_id": "m27-710041-4",
      "answer": "triple",
      "label": "Three groups of two (3/4)",
      "explanation": "The stronger attacks fall every two eighth notes: ONE and TWO and THREE and. These are three quarter-note beats in 3/4.",
      "notation": {
        "clef": "treble",
        "notes": [
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5"
        ],
        "bar_beats": 3
      },
      "rhythm": [
        {
          "onset_beats": 0,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 0.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
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        {
          "onset_beats": 1,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
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          "duration_beats": 0.5,
          "rest": false,
          "accent": false
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          "duration_beats": 0.5,
          "rest": false,
          "accent": true
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        {
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          "duration_beats": 0.5,
          "rest": false,
          "accent": false
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          "rest": false,
          "accent": true
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        {
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          "duration_beats": 0.5,
          "rest": false,
          "accent": false
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          "duration_beats": 0.5,
          "rest": false,
          "accent": true
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        {
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          "duration_beats": 0.5,
          "rest": false,
          "accent": false
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        {
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          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
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          "duration_beats": 0.5,
          "rest": false,
          "accent": false
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      ],
      "total_beats": 6
    },
    {
      "number": 6,
      "question_id": "m27-710041-5",
      "answer": "triple",
      "label": "Three groups of two (3/4)",
      "explanation": "The stronger attacks fall every two eighth notes: ONE and TWO and THREE and. These are three quarter-note beats in 3/4.",
      "notation": {
        "clef": "treble",
        "notes": [
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5"
        ],
        "bar_beats": 3
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          "rest": false,
          "accent": true
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          "duration_beats": 0.5,
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          "duration_beats": 0.5,
          "rest": false,
          "accent": true
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          "duration_beats": 0.5,
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          "rest": false,
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          "duration_beats": 0.5,
          "rest": false,
          "accent": true
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          "duration_beats": 0.5,
          "rest": false,
          "accent": false
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          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
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          "duration_beats": 0.5,
          "rest": false,
          "accent": false
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      ],
      "total_beats": 6
    },
    {
      "number": 7,
      "question_id": "m27-710041-6",
      "answer": "triple",
      "label": "Three groups of two (3/4)",
      "explanation": "The stronger attacks fall every two eighth notes: ONE and TWO and THREE and. These are three quarter-note beats in 3/4.",
      "notation": {
        "clef": "treble",
        "notes": [
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5"
        ],
        "bar_beats": 3
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      "rhythm": [
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          "duration_beats": 0.5,
          "rest": false,
          "accent": true
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        {
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          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
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          "duration_beats": 0.5,
          "rest": false,
          "accent": true
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        {
          "onset_beats": 1.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
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          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 2.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 3,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 3.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 4,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 4.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 5.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
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      ],
      "total_beats": 6
    },
    {
      "number": 8,
      "question_id": "m27-710041-7",
      "answer": "triple",
      "label": "Three groups of two (3/4)",
      "explanation": "The stronger attacks fall every two eighth notes: ONE and TWO and THREE and. These are three quarter-note beats in 3/4.",
      "notation": {
        "clef": "treble",
        "notes": [
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5"
        ],
        "bar_beats": 3
      },
      "rhythm": [
        {
          "onset_beats": 0,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 0.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 1,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 1.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 2,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 2.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 3,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 3.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 4,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
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          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
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          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 5.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
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      ],
      "total_beats": 6
    },
    {
      "number": 9,
      "question_id": "m27-710041-8",
      "answer": "triple",
      "label": "Three groups of two (3/4)",
      "explanation": "The stronger attacks fall every two eighth notes: ONE and TWO and THREE and. These are three quarter-note beats in 3/4.",
      "notation": {
        "clef": "treble",
        "notes": [
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5"
        ],
        "bar_beats": 3
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      "rhythm": [
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          "onset_beats": 0,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
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        {
          "onset_beats": 0.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 1,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 1.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 2,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 2.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 3,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
          "onset_beats": 3.5,
          "duration_beats": 0.5,
          "rest": false,
          "accent": false
        },
        {
          "onset_beats": 4,
          "duration_beats": 0.5,
          "rest": false,
          "accent": true
        },
        {
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          "duration_beats": 0.5,
          "rest": false,
          "accent": false
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        {
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          "duration_beats": 0.5,
          "rest": false,
          "accent": true
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        {
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          "duration_beats": 0.5,
          "rest": false,
          "accent": false
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      ],
      "total_beats": 6
    },
    {
      "number": 10,
      "question_id": "m27-710041-9",
      "answer": "triple",
      "label": "Three groups of two (3/4)",
      "explanation": "The stronger attacks fall every two eighth notes: ONE and TWO and THREE and. These are three quarter-note beats in 3/4.",
      "notation": {
        "clef": "treble",
        "notes": [
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5",
          "A5",
          "E5"
        ],
        "bar_beats": 3
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          "duration_beats": 0.5,
          "rest": false,
          "accent": true
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        {
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          "rest": false,
          "accent": true
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        {
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          "duration_beats": 0.5,
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          "duration_beats": 0.5,
          "rest": false,
          "accent": true
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        {
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          "duration_beats": 0.5,
          "rest": false,
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          "rest": false,
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        {
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          "rest": false,
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      "total_beats": 6
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  "record": {
    "learner": "",
    "date": "",
    "first_responses": "",
    "same_question_corrections": "",
    "new_question_check": ""
  }
}